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A transformer whose secondary is short circuited while rated voltage is applied will

  • A.draw no current at all
  • B.operate at improved efficiency under that condition
  • C.draw a very large current and be damaged unless protected
  • D.draw its rated current and operate normally

Answer: C

Only the leakage impedance limits the current, so with five per cent impedance it reaches twenty times rated and the winding forces are four hundred times normal. Protection must clear such a fault within a fraction of a second.

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